How to store string reels correctly?

Recently, I experienced some strange behavior of my strings. Strung Cannon silverstring mains 28kg, and Gamma TNT cross at 25kg. First time it played great, then after about a week off, it played horrible - like a wood plate... I suspect they were stored somewhat improperly in my closet.

Any insight on this, please?
Storing it in a freezer - does it make sense, when temperatures and humidity in the room are not stable?

polys tend to lose a lot of tension in the first few days and this is what you experienced. putting your racquet in the freezer would additionally affect the racquet, as also does keeping it in the trunk of your car on a hot summer day.
there are not many polys that keep tension acceptable (well would be the wrong term anyway). some die quick, others die later. i use kirschbaum competition regularly and lately have also employe luxilon adrenaline. these strings last about 8 hitting hours with my style of play, usually done in about two weeks. in this timespan both strings keep the tension very reasonably.

Strings tends to lose tension, however the quality of the string might be an issue. After a while strings tend to lose their ability to perform. The lower the quality, the more it'll show. I would recommend, keeping in a room where temp doesnt change too often and there is very little humidity. And keep it in the bag if you arent doing so.

You'd think this was a wine or coffee forum with some of these responses. Synthetic strings are not adversely affected by storing them in a closet or bedroom. They just aren't. If you want to talk about gut, then that's a bit different, but a polyester string reel stored just about anywhere is not going to degrade significantly unless it's for some reason stored in direct sunlight for all of its life.

One another observation:
after I played this hybrid the third time, and tried to hit harder than usual, after ~1 hour it seemed to ease up, and played more reasonable. Is it that it works like a human body, t.e. it requires some warm up? Or was it my body actually ?

Well, it does not suit actually any of the scenarios mentioned above, that poly goes dead after X time. It looks like it woke up to life again...

One another observation:
after I played this hybrid the third time, and tried to hit harder than usual, after ~1 hour it seemed to ease up, and played more reasonable. Is it that it works like a human body, t.e. it requires some warm up? Or was it my body actually ?

Well, it does not suit actually any of the scenarios mentioned above, that poly goes dead after X time. It looks like it woke up to life again...

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i think it's just your body getting used to the string. though many people have noticed string that plays better under certain tension, and losing tension is just another way to get there. so maybe the tension loss finally hit a sweet spot for what you like the string tension to be, inevitably the tension will keep droping. if you like the way your setup hits from here till you break the string just tension the string lower next time till you start out at the preferred tension.

parasailing,
i'm a long time multiuser (nxt tour, sensation, now mantis comfort synthetic, etc.) and never had issues with storing, as long as you avoid extremes and direct sunlight. don't keep it in the trunk of your car on a hot summer day or freezing winter night and don't keep it in the fridge either. i'd wonder if you'd have any issues with this. i've kept reels for almost a year and had no problems whatsoever.

parasailing,
i'm a long time multiuser (nxt tour, sensation, now mantis comfort synthetic, etc.) and never had issues with storing, as long as you avoid extremes and direct sunlight. don't keep it in the trunk of your car on a hot summer day or freezing winter night and don't keep it in the fridge either. i'd wonder if you'd have any issues with this. i've kept reels for almost a year and had no problems whatsoever.

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Thanks fgs for your experience as I heard from someone I know who strings his team's racquets that reels dry up to fast but that could be due to the way he stores them. He just has them at his workplace.

I plan on keeping it in a dry place inside my desk drawer where the temperature ranges from 30 to 70 degrees Farenheit.

Since I hit with a KPS 88, I only need 30 feet of string which allows me to get about 22 string jobs per reel which makes it significantly cheaper.